Half to john a



(No Model.) 2 Sheets-Sheet 1. J. MGINTYRE.

\ SHIPS KEBLSON. No. 393,713. Patented Nov; 27, 1888.

N. FEYERS. Phola-Lflhagrapher. Washmgtoq. D.C

2 Sheets-Sheet 2.

(No Model.

J. MQINTYRE.

SHIPS KEELSON.

No. 393,713. Patented Nov. 2'7, 1888.

UNITED STATES PATENT OFFICE.

JAMES MOINTYRE, OF BOSTON, MASSACHUSETTS, ASSIGNOR OF ONE- HALF TO JOHNA. STETSON, OF SAME PLACE.

SHIPS KEELSON.

SPECIFICATION forming part of Letters Patent No. 398,713, dated November27,1888.

Application filed October 24, 1887.

To all whom it may concern.-

Be it known that I, JAMES MOINTYRE, of Boston, in the county of Suffolkand State of Massachusetts, have invented a new and useful Improvementin the Art of Ship-Building, of which the following is a specification,reference being had to the accompanying drawings, in which- Figure 1 isa plan of a portion of the hull of a vessel embodying my invention. Fig.2 is a longitudinal section on line 2 2 of Fig. 1. Fig. 3 is across-section on line 3 3 of Fig. 1. Fig: 4 is a cross sectional view ofa keelsonsection on line 44 of Fig. 1. Fig. 5 is a similar view showingplates attached to the keelsonsection.

My invention consists, mainly, in a keelson made up of sections, eachhaving one or more cross-walls which are integral with its side walls,the sections being secured together end to end.

Other features of my invention are set forth hereinafter.

In the drawings, which show my invention embodied in the best way nowknown to me,A is a keelson'which is made up ofa series of see tions, ata, 8150., which are secured together end to end. The keelson-sectionsfor the stern and prow each have but one cross end wall, I The sectionsfor the intermediate portions of the keelson, however, each have twocrosswalls,b,onewallateach endofthesection. The keel-sections have theirside and end walls integral,aud are preferably of cast metal, thoughthey may be made of molded pulp, if desired, and the sections aresecured together end to end by fastenings d, some of which consist ofbolts and nuts, while others consist of clamps and keys, as shown. Theobject of using the clamps and keys is to insure the tightness of thecompound keelson A in stress of weather, when there might be some dangerof the threads of the bolts being stripped, and of the vesselconsequently leaking between the adjacent ends of the keelson-sections,as will be readily understood by all skilled in the art. The cross-wallsb of the keelson-sections are best formed with recesses b on their outersurfaces, so that the joints formed at the junction of Serial No.253,261. (No model.)

two keelson sections may be more tightly calked, the recesses beingpacked or filled with any material suitable for this purpose.

The keelsonsections shown in the drawings are provided withcross-piecesf,to sustain the ribs f, as fully explained in my patent,No. 367,828, dated August 9, 1887, and the plankingf is best secured tothe ribs, as explained in that patent.

In order to 'more strongly secure together the sections a a, &c., andthereby enable the vessel built upon my new keelson to stand stress ofweather, the bottoms of the sections a a, &c., are groovedlongitudinally to receive keelplate D, which is secured to the bottom ofthe compound keelson by suitable fastenings, d. Keel-plate D is bestmade sufficientl y thick to project beyond the bottom of the keelson andto fit in a groove in the keel E, which is preferably secured tothekeelson A by a series of bolts, 6. In order to more certainly secure thekeel E to keelson A,the sections a a, &c., are formed with shoulders I)and ears I) on their inner surfaces, and these shoulders and ears arebored to receive the bolts 6 through the keel E. The nuts e,bearing onthe upper surface of the shoulders I) and ears 6*, serve to keep thebolts in place and to hold the keel against the bottom of the compoundkeelson, and the nuts 6 on bolts e,bearing against the under surface ofthe ears b ytend to prevent the bolts 6 from being moved inwardly whenthe keel strikes against rocks or the like, and so help to secure thekeel in place.

Keel E is specially desirable in vessels whose hulls are to be coppered,as will be readily understood by allskilledin the art. Of course keel Emay be dispensed with, if desired, in which case keel-plate D serves asthe keel.

In Fig. 5, which is a cross-sectional View of my keelson with metalplates f secured to it, the plate D is the keel.

Keelsons of vessels embodying my invention are quickly and cheaply made,as will be plain to all skilled in the art, the cast-metal or moldedpulp vessel-like keelson-sections being readily produced, easilyhandled, and quickly secured together, as will be plain to all skilledin the art, and by means of my invention I am enabled to produce strongand durable vessels of different kinds with economy of time and labor.

\Vhat I claim is- 1. In a vessel, the compound keelson herein described,made up 01' two or more separate sections, the side and end walls ofwhich are integral, the sections being secured together end to end,substantially as and for the pun pose set forth.

2. In a vessel, the compound keelson herein described, made up of two ormore separate sections, the end and side walls of which are integral,the sections being secured together end to end, and the end walls of thesections being recessed on their outer surfaces, substantially as andfor the purpose set forth.

3. In a vessel, the compound keelson herein described, made up of two ormore separate sections, the end and side walls of which are integral, incombination with a longitudinal keel-plate secured to the compoundkeclson, substantially as and for the purpose set forth.

4. In a vessel, the compound keelson herein described, made up of two ormore separate sections, the end and side walls of which are integral,the sections being secured together end to end and provided with one ormore cross-pieces to sustain the ribs, substantially as and for thepurpose set forth.

J AMES MulNTYR-E.

W il nesses:

EDWARD S. Bmon, ."ionN it. Ssow.

